CEOs generally work longer than most people because they have to think of better ways to keep their empire a float and relevant to the the society.

Mark Zuckerberg, the CEO of facebook once said in an interview that he works alot but i all depends on what we see as work. He practically spends 50-60 hours in the office but if you add the time he spends in thought of how to serve the community better, its his whole life.

Nevertheless he has found a way to strike a balance between work and life which makes it a bit easier.